Offset Printing Color Stability via Alternating Separation Order
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Solution Overview
Problem
Offset printing technologies face challenges in maintaining color stability between consecutive pages due to slight differences in separation reproduction caused by uneven wear on the photo imaging drum, leading to undesirable color shifts.
Innovation Solution
The method involves alternating the print order of certain color separations between odd and even pages by assigning specific sides of the photo imaging drum for each page, ensuring that cyan and magenta separations are always printed on the same side, thereby reducing color differences and improving perceived color accuracy without introducing delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional printing methods are used with sequential color separation printing, then printing productivity is maintained, but color stability deteriorates due to uneven drum wear causing color shifts between pages
Solution Approach 1:
The patent applies dynamics by making the print order flexible and adaptive rather than fixed. The system dynamically adjusts the printing sequence of color separations based on whether the page number is odd or even, allowing the same printing apparatus to maintain color stability without requiring physical modifications or additional components.
Solution Approach 2:
The patent implements periodic action by alternating the print order of color separations in a regular pattern between odd and even pages. This periodic reversal ensures that cyan and magenta separations are consistently printed on the same drum sides for both odd and even pages, eliminating color shifts while maintaining continuous printing operation.
2Manufacturing precision
If the print order of color separations is changed to maintain color stability, then color accuracy improves, but printing time increases due to additional cycles
Solution Approach 1:
The patent uses periodic action to reverse the print order alternately for odd and even pages, ensuring that cyan and magenta separations are printed on the same drum sides consistently. This periodic reversal achieves color accuracy without requiring additional printing cycles or NULL operations, as the reversal is seamlessly integrated into the normal printing flow.
Solution Approach 2:
The system dynamically adjusts the print order based on page number parity (odd/even), allowing the printing apparatus to maintain color accuracy while operating continuously without interruption. The dynamic reordering eliminates the need for停顿 or additional cycles that would increase printing time.
3Reliability
If NULL cycles are introduced to reset drum position for color consistency, then color stability improves, but productivity decreases due to wasted printing cycles
Solution Approach 1:
The patent eliminates the need for NULL cycles by implementing periodic reversal of the print order for odd and even pages. This approach maintains color consistency by ensuring cyan and magenta separations are printed on the same drum sides without requiring any wasted printing cycles or reset operations, thus preserving full printing productivity.
Solution Approach 2:
The patent extracts and eliminates the harmful NULL cycles from the printing process by finding an alternative solution (periodic print order reversal) that achieves the same color consistency goal without the productivity penalty. This removes the wasteful element while retaining the beneficial effect.
Data Source
AI summary
An apparatus and method for use in generating a print job for an offset printing apparatus. The method comprising determining a print job to be printed on the offset printer comprises an odd number of separations, and in response to determining that the print job comprises an odd number of separations, alternating a print order of at least two separations between odd and even pages of the print job.